git.sur5r.net Git - u-boot/blob - cmd/bootefi.c

   1 /*
   2  *  EFI application loader
   3  *
   4  *  Copyright (c) 2016 Alexander Graf
   5  *
   6  *  SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <command.h>
  11 #include <dm.h>
  12 #include <efi_loader.h>
  13 #include <errno.h>
  14 #include <libfdt.h>
  15 #include <libfdt_env.h>
  16 #include <memalign.h>
  17 #include <asm/global_data.h>
  18 #include <asm-generic/sections.h>
  19 #include <linux/linkage.h>
  20
  21 DECLARE_GLOBAL_DATA_PTR;
  22
  23 static uint8_t efi_obj_list_initalized;
  24
  25 static struct efi_device_path *bootefi_image_path;
  26 static struct efi_device_path *bootefi_device_path;
  27
  28 /* Initialize and populate EFI object list */
  29 static void efi_init_obj_list(void)
  30 {
  31         efi_obj_list_initalized = 1;
  32
  33         efi_console_register();
  34 #ifdef CONFIG_PARTITIONS
  35         efi_disk_register();
  36 #endif
  37 #if defined(CONFIG_LCD) || defined(CONFIG_DM_VIDEO)
  38         efi_gop_register();
  39 #endif
  40 #ifdef CONFIG_NET
  41         efi_net_register();
  42 #endif
  43 #ifdef CONFIG_GENERATE_SMBIOS_TABLE
  44         efi_smbios_register();
  45 #endif
  46         efi_watchdog_register();
  47
  48         /* Initialize EFI runtime services */
  49         efi_reset_system_init();
  50         efi_get_time_init();
  51 }
  52
  53 static void *copy_fdt(void *fdt)
  54 {
  55         u64 fdt_size = fdt_totalsize(fdt);
  56         unsigned long fdt_ram_start = -1L, fdt_pages;
  57         u64 new_fdt_addr;
  58         void *new_fdt;
  59         int i;
  60
  61         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
  62                 u64 ram_start = gd->bd->bi_dram[i].start;
  63                 u64 ram_size = gd->bd->bi_dram[i].size;
  64
  65                 if (!ram_size)
  66                         continue;
  67
  68                 if (ram_start < fdt_ram_start)
  69                         fdt_ram_start = ram_start;
  70         }
  71
  72         /* Give us at least 4kb breathing room */
  73         fdt_size = ALIGN(fdt_size + 4096, EFI_PAGE_SIZE);
  74         fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
  75
  76         /* Safe fdt location is at 128MB */
  77         new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size;
  78         if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages,
  79                                &new_fdt_addr) != EFI_SUCCESS) {
  80                 /* If we can't put it there, put it somewhere */
  81                 new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
  82                 if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages,
  83                                        &new_fdt_addr) != EFI_SUCCESS) {
  84                         printf("ERROR: Failed to reserve space for FDT\n");
  85                         return NULL;
  86                 }
  87         }
  88
  89         new_fdt = (void*)(ulong)new_fdt_addr;
  90         memcpy(new_fdt, fdt, fdt_totalsize(fdt));
  91         fdt_set_totalsize(new_fdt, fdt_size);
  92
  93         return new_fdt;
  94 }
  95
  96 static efi_status_t efi_do_enter(
  97                         void *image_handle, struct efi_system_table *st,
  98                         asmlinkage ulong (*entry)(void *image_handle,
  99                                                   struct efi_system_table *st))
 100 {
 101         efi_status_t ret = EFI_LOAD_ERROR;
 102
 103         if (entry)
 104                 ret = entry(image_handle, st);
 105         st->boottime->exit(image_handle, ret, 0, NULL);
 106         return ret;
 107 }
 108
 109 #ifdef CONFIG_ARM64
 110 static efi_status_t efi_run_in_el2(asmlinkage ulong (*entry)(
 111                         void *image_handle, struct efi_system_table *st),
 112                         void *image_handle, struct efi_system_table *st)
 113 {
 114         /* Enable caches again */
 115         dcache_enable();
 116
 117         return efi_do_enter(image_handle, st, entry);
 118 }
 119 #endif
 120
 121 /*
 122  * Load an EFI payload into a newly allocated piece of memory, register all
 123  * EFI objects it would want to access and jump to it.
 124  */
 125 static efi_status_t do_bootefi_exec(void *efi, void *fdt,
 126                                     struct efi_device_path *device_path,
 127                                     struct efi_device_path *image_path)
 128 {
 129         struct efi_loaded_image loaded_image_info = {};
 130         struct efi_object loaded_image_info_obj = {};
 131         struct efi_device_path *memdp = NULL;
 132         ulong ret;
 133
 134         ulong (*entry)(void *image_handle, struct efi_system_table *st)
 135                 asmlinkage;
 136         ulong fdt_pages, fdt_size, fdt_start, fdt_end;
 137         const efi_guid_t fdt_guid = EFI_FDT_GUID;
 138         bootm_headers_t img = { 0 };
 139
 140         /*
 141          * Special case for efi payload not loaded from disk, such as
 142          * 'bootefi hello' or for example payload loaded directly into
 143          * memory via jtag/etc:
 144          */
 145         if (!device_path && !image_path) {
 146                 printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
 147                 /* actual addresses filled in after efi_load_pe() */
 148                 memdp = efi_dp_from_mem(0, 0, 0);
 149                 device_path = image_path = memdp;
 150         } else {
 151                 assert(device_path && image_path);
 152         }
 153
 154         /* Initialize and populate EFI object list */
 155         if (!efi_obj_list_initalized)
 156                 efi_init_obj_list();
 157
 158         efi_setup_loaded_image(&loaded_image_info, &loaded_image_info_obj,
 159                                device_path, image_path);
 160
 161         /*
 162          * gd lives in a fixed register which may get clobbered while we execute
 163          * the payload. So save it here and restore it on every callback entry
 164          */
 165         efi_save_gd();
 166
 167         if (fdt && !fdt_check_header(fdt)) {
 168                 /* Prepare fdt for payload */
 169                 fdt = copy_fdt(fdt);
 170
 171                 if (image_setup_libfdt(&img, fdt, 0, NULL)) {
 172                         printf("ERROR: Failed to process device tree\n");
 173                         return -EINVAL;
 174                 }
 175
 176                 /* Link to it in the efi tables */
 177                 efi_install_configuration_table(&fdt_guid, fdt);
 178
 179                 /* And reserve the space in the memory map */
 180                 fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK;
 181                 fdt_end = ((ulong)fdt) + fdt_totalsize(fdt);
 182                 fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK;
 183                 fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
 184                 /* Give a bootloader the chance to modify the device tree */
 185                 fdt_pages += 2;
 186                 efi_add_memory_map(fdt_start, fdt_pages,
 187                                    EFI_BOOT_SERVICES_DATA, true);
 188         } else {
 189                 printf("WARNING: Invalid device tree, expect boot to fail\n");
 190                 efi_install_configuration_table(&fdt_guid, NULL);
 191         }
 192
 193         /* Load the EFI payload */
 194         entry = efi_load_pe(efi, &loaded_image_info);
 195         if (!entry) {
 196                 ret = -ENOENT;
 197                 goto exit;
 198         }
 199
 200         if (memdp) {
 201                 struct efi_device_path_memory *mdp = (void *)memdp;
 202                 mdp->memory_type = loaded_image_info.image_code_type;
 203                 mdp->start_address = (uintptr_t)loaded_image_info.image_base;
 204                 mdp->end_address = mdp->start_address +
 205                                 loaded_image_info.image_size;
 206         }
 207
 208         /* we don't support much: */
 209         env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
 210                 "{ro,boot}(blob)0000000000000000");
 211
 212         /* Call our payload! */
 213         debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
 214
 215         if (setjmp(&loaded_image_info.exit_jmp)) {
 216                 ret = loaded_image_info.exit_status;
 217                 goto exit;
 218         }
 219
 220 #ifdef CONFIG_ARM64
 221         /* On AArch64 we need to make sure we call our payload in < EL3 */
 222         if (current_el() == 3) {
 223                 smp_kick_all_cpus();
 224                 dcache_disable();       /* flush cache before switch to EL2 */
 225
 226                 /* Move into EL2 and keep running there */
 227                 armv8_switch_to_el2((ulong)entry, (ulong)&loaded_image_info,
 228                                     (ulong)&systab, 0, (ulong)efi_run_in_el2,
 229                                     ES_TO_AARCH64);
 230
 231                 /* Should never reach here, efi exits with longjmp */
 232                 while (1) { }
 233         }
 234 #endif
 235
 236         ret = efi_do_enter(&loaded_image_info, &systab, entry);
 237
 238 exit:
 239         /* image has returned, loaded-image obj goes *poof*: */
 240         list_del(&loaded_image_info_obj.link);
 241
 242         return ret;
 243 }
 244
 245 static int do_bootefi_bootmgr_exec(unsigned long fdt_addr)
 246 {
 247         struct efi_device_path *device_path, *file_path;
 248         void *addr;
 249         efi_status_t r;
 250
 251         /* Initialize and populate EFI object list */
 252         if (!efi_obj_list_initalized)
 253                 efi_init_obj_list();
 254
 255         /*
 256          * gd lives in a fixed register which may get clobbered while we execute
 257          * the payload. So save it here and restore it on every callback entry
 258          */
 259         efi_save_gd();
 260
 261         addr = efi_bootmgr_load(&device_path, &file_path);
 262         if (!addr)
 263                 return 1;
 264
 265         printf("## Starting EFI application at %p ...\n", addr);
 266         r = do_bootefi_exec(addr, (void *)fdt_addr, device_path, file_path);
 267         printf("## Application terminated, r = %lu\n",
 268                r & ~EFI_ERROR_MASK);
 269
 270         if (r != EFI_SUCCESS)
 271                 return 1;
 272
 273         return 0;
 274 }
 275
 276 /* Interpreter command to boot an arbitrary EFI image from memory */
 277 static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 278 {
 279         char *saddr, *sfdt;
 280         unsigned long addr, fdt_addr = 0;
 281         efi_status_t r;
 282
 283         if (argc < 2)
 284                 return CMD_RET_USAGE;
 285 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 286         if (!strcmp(argv[1], "hello")) {
 287                 ulong size = __efi_helloworld_end - __efi_helloworld_begin;
 288
 289                 saddr = env_get("loadaddr");
 290                 if (saddr)
 291                         addr = simple_strtoul(saddr, NULL, 16);
 292                 else
 293                         addr = CONFIG_SYS_LOAD_ADDR;
 294                 memcpy((char *)addr, __efi_helloworld_begin, size);
 295         } else
 296 #endif
 297 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 298         if (!strcmp(argv[1], "selftest")) {
 299                 struct efi_loaded_image loaded_image_info = {};
 300                 struct efi_object loaded_image_info_obj = {};
 301
 302                 efi_setup_loaded_image(&loaded_image_info,
 303                                        &loaded_image_info_obj,
 304                                        bootefi_device_path, bootefi_image_path);
 305                 /*
 306                  * gd lives in a fixed register which may get clobbered while we
 307                  * execute the payload. So save it here and restore it on every
 308                  * callback entry
 309                  */
 310                 efi_save_gd();
 311                 /* Initialize and populate EFI object list */
 312                 if (!efi_obj_list_initalized)
 313                         efi_init_obj_list();
 314                 return efi_selftest(&loaded_image_info, &systab);
 315         } else
 316 #endif
 317         if (!strcmp(argv[1], "bootmgr")) {
 318                 unsigned long fdt_addr = 0;
 319
 320                 if (argc > 2)
 321                         fdt_addr = simple_strtoul(argv[2], NULL, 16);
 322
 323                 return do_bootefi_bootmgr_exec(fdt_addr);
 324         } else {
 325                 saddr = argv[1];
 326
 327                 addr = simple_strtoul(saddr, NULL, 16);
 328
 329                 if (argc > 2) {
 330                         sfdt = argv[2];
 331                         fdt_addr = simple_strtoul(sfdt, NULL, 16);
 332                 }
 333         }
 334
 335         printf("## Starting EFI application at %08lx ...\n", addr);
 336         r = do_bootefi_exec((void *)addr, (void *)fdt_addr,
 337                             bootefi_device_path, bootefi_image_path);
 338         printf("## Application terminated, r = %lu\n",
 339                r & ~EFI_ERROR_MASK);
 340
 341         if (r != EFI_SUCCESS)
 342                 return 1;
 343         else
 344                 return 0;
 345 }
 346
 347 #ifdef CONFIG_SYS_LONGHELP
 348 static char bootefi_help_text[] =
 349         "<image address> [fdt address]\n"
 350         "  - boot EFI payload stored at address <image address>.\n"
 351         "    If specified, the device tree located at <fdt address> gets\n"
 352         "    exposed as EFI configuration table.\n"
 353 #ifdef CONFIG_CMD_BOOTEFI_HELLO
 354         "bootefi hello\n"
 355         "  - boot a sample Hello World application stored within U-Boot\n"
 356 #endif
 357 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 358         "bootefi selftest\n"
 359         "  - boot an EFI selftest application stored within U-Boot\n"
 360 #endif
 361         "bootmgr [fdt addr]\n"
 362         "  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
 363         "\n"
 364         "    If specified, the device tree located at <fdt address> gets\n"
 365         "    exposed as EFI configuration table.\n";
 366 #endif
 367
 368 U_BOOT_CMD(
 369         bootefi, 3, 0, do_bootefi,
 370         "Boots an EFI payload from memory",
 371         bootefi_help_text
 372 );
 373
 374 static int parse_partnum(const char *devnr)
 375 {
 376         const char *str = strchr(devnr, ':');
 377         if (str) {
 378                 str++;
 379                 return simple_strtoul(str, NULL, 16);
 380         }
 381         return 0;
 382 }
 383
 384 void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
 385 {
 386         char filename[32] = { 0 }; /* dp->str is u16[32] long */
 387         char *s;
 388
 389         if (strcmp(dev, "Net")) {
 390                 struct blk_desc *desc;
 391                 int part;
 392
 393                 desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10));
 394                 part = parse_partnum(devnr);
 395
 396                 bootefi_device_path = efi_dp_from_part(desc, part);
 397         } else {
 398 #ifdef CONFIG_NET
 399                 bootefi_device_path = efi_dp_from_eth();
 400 #endif
 401         }
 402
 403         if (!path)
 404                 return;
 405
 406         if (strcmp(dev, "Net")) {
 407                 /* Add leading / to fs paths, because they're absolute */
 408                 snprintf(filename, sizeof(filename), "/%s", path);
 409         } else {
 410                 snprintf(filename, sizeof(filename), "%s", path);
 411         }
 412         /* DOS style file path: */
 413         s = filename;
 414         while ((s = strchr(s, '/')))
 415                 *s++ = '\\';
 416         bootefi_image_path = efi_dp_from_file(NULL, 0, filename);
 417 }